Voronov on string topology
Sasha Voronov's string topology lectures, used this term in Math 8390: Topics in Mathematical Physics, have been available on the arXiv (math.GT/0503625), but now have also appeared in book form:
Ralph L. Cohen and Alexander A. Voronov. "Notes on String Topology" in String Topology and Cyclic Homology. Advanced courses in mathematics, CRM Barcelona. Basel; Boston: Birkhauser, 2006, pp. 1-95. Link to MnCat Record
After a 2003 summer school in Almeria, the paper is "the joint account of the two lecture series which focused on string topology (Cohen and Voronov). It discusses the loop product from the original point of view of Chas and Sulllivan, from the Cohen-Jones stable point of view, as well as Voronov's operadic point of view."
The book includes another paper dealing with free loop spaces: Kathryn Hess's lectures on "the construction of algebraic models for computing topological cyclic homology. Starting with the study of free loop spaces and their algebraic models, it continues with homotopy orbit spaces of circle actions, and culminates in the Hess-Rognes construction of a model for computing spectrum cohomology of topological cyclic homology."
Kathryn Hess. "An Algebraic Model for Mod 2 Topological Cyclic Homology" in String Topology and Cyclic Homology. Advanced courses in mathematics, CRM Barcelona. Basel; Boston: Birkhauser, 2006, pp. 97-163. Link to MnCat Record (also available on the arXiv: math.AT/0412271)